Inverted EPR signal from nitrogen defects in a synthetic diamond single crystal at room temperature

Nanoporous diamond films up to 20 µ m thick with a pore size of 1-1.5 nm and porosities from 0.4 to 0.6 are produced by selective etching in air. The effect of hydrogen plasma processing on the IR absorption and electron paramagnetic resonance spectra of the films is investigated. The results indicate that the concentration of bonded hydrogen in the hydrogenated nanoporous diamond films attains 20 at %. The kinetics of hydrogen desorption are studied as a function of temperature.

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“…The same was evidenced the variation of the EPR signal with microwave power (Fig. 4), which differed markedly from that for the P1 center [21].…”

Section: Resultssupporting

confidence: 64%

Hydrogenated Nanoporous Diamond Films

et al. 2005

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“…6 in [33]) is other manifestation of the resonance under discussion. In the regime of strong-resonant modulation, the inversion of the in-phase EPR signal of the P1 centers in diamond has also been observed at increasing the MW power [34].…”

Section: Discussionmentioning

confidence: 86%

Multi-photon transitions and Rabi resonance in continuous wave EPR

Saǐko

Fedaruk

Markevich

2015

Journal of Magnetic Resonance

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Abstract. The study of microwave and radiofrequency multi-photon transitions in continuous wave (CW) EPR spectroscopy is extended to a Rabi resonance condition, when the radio frequency of the magnetic-field modulation matches the Rabi frequency of a spin system in the microwave field. Using the non-secular perturbation theory based on the Bogoliubov averaging method, the analytical description of the response of the spin system is derived for all modulation frequency harmonics. When the modulation frequency exceeds the EPR linewidth, multi-photon transitions result in sidebands in absorption EPR spectra measured with phasesensitive detection at any harmonic. The saturation of different-order multi-photon transitions is shown to be significantly different and to be sensitive to the Rabi resonance. The noticeable frequency shifts of sidebands are found to be the signatures of this resonance. The inversion of two-photon lines in some spectral intervals of the out-of-phase first-harmonic signal is predicted under passage through the Rabi resonance. The inversion indicates the transition from absorption to stimulated emission or vice versa, depending on the sideband. The manifestation of the primary and secondary Rabi resonance is also demonstrated in time-resolved steady-state EPR signals formed by all harmonics of the modulation frequency. Our results provide a theoretical framework for future developments in multi-photon CW EPR spectroscopy, which can be useful for samples with long spin relaxation times and extremely narrow EPR lines.

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“…The ability to prepare and read the quantum state of the triplet sub-levels efficiently using optically detected magnetic resonance has enabled many applications of NV − centres in magnetometry [12][13][14] and quantum information processing [15]. They were recently proposed as quantum emitters for room-temperature masers [4][5][6] due to their attractive properties of long spin dephasing times (>1 µs), long spin-polarisation lifetimes ∼ 5 ms [16,17] and triplet ground-states that can be polarized through optical pumping [18,19]. Furthermore, diamond has the highest thermal conductivity ∼ 10 3 Wm −1 K −1 and excellent mechanical properties, which obviates thermal runaway.…”

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confidence: 99%

“…Furthermore, organic maser molecules have poor thermal and mechanical properties, and their triplet sub-level decay rates make continuous emission challenging: alternative materials are therefore required. Therefore, inorganic materials containing spin-defects such as diamond [4][5][6] and silicon carbide [7] have been proposed. Here we report a continuous-wave (CW) room-temperature maser oscillator using optically pumped nitrogen-vacancy (NV − ) defect centres in diamond.…”

mentioning

confidence: 99%

Continuous-wave room-temperature diamond maser

Breeze

Salvadori

Sathian

et al. 2018

Nature

166

163

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The maser-the microwave progenitor of the optical laser-has been confined to relative obscurity owing to its reliance on cryogenic refrigeration and high-vacuum systems. Despite this, it has found application in deep-space communications and radio astronomy owing to its unparalleled performance as a low-noise amplifier and oscillator. The recent demonstration of a room-temperature solid-state maser that utilizes polarized electron populations within the triplet states of photo-excited pentacene molecules in a p-terphenyl host paves the way for a new class of maser. However, p-terphenyl has poor thermal and mechanical properties, and the decay rates of the triplet sublevel of pentacene mean that only pulsed maser operation has been observed in this system. Alternative materials are therefore required to achieve continuous emission: inorganic materials that contain spin defects, such as diamond and silicon carbide, have been proposed. Here we report a continuous-wave room-temperature maser oscillator using optically pumped nitrogen-vacancy defect centres in diamond. This demonstration highlights the potential of room-temperature solid-state masers for use in a new generation of microwave devices that could find application in medicine, security, sensing and quantum technologies.

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Inverted EPR signal from nitrogen defects in a synthetic diamond single crystal at room temperature

Cited by 8 publications

References 15 publications

Hydrogenated Nanoporous Diamond Films

Hydrogenated Nanoporous Diamond Films

Multi-photon transitions and Rabi resonance in continuous wave EPR

Continuous-wave room-temperature diamond maser

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